package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.github.pagehelper.PageHelper;
import com.sky.WebSoket.WebSocketServer;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.OrdersPageQueryDTO;
import com.sky.dto.OrdersPaymentDTO;
import com.sky.dto.OrdersSubmitDTO;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.sql.Time;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer; //为了给客户端推送消息

    /**
     * 用户下单（提交订单）
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //处理各种业务异常(地址簿为空、购物车数据为空)
        AddressBook addressBook= addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook==null){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        Long userId = BaseContext.getCurrentId();
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId,userId);
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.selectList(lqw);
        if (shoppingCarts==null||shoppingCarts.size()==0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //添加数据
        Orders orders = CreateOrder(ordersSubmitDTO,shoppingCarts,addressBook,userId);
        //向订单表插入1条数据
        orderMapper.insert(orders);
        System.out.println("用户id："+orders.getId());

        //向订单明细表插入n条数据
        for (ShoppingCart shoppingCart:shoppingCarts){
            OrderDetail orderDetail = new OrderDetail();//订单明细
            BeanUtils.copyProperties(shoppingCart,orderDetail);
            orderDetail.setOrderId(orders.getId());//设置当前订单明细关联的订单id
            orderDetailMapper.insert(orderDetail);
        }

        //清空当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,userId);
        shoppingCartMapper.delete(queryWrapper);

        //封装V0返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付（确定支付）
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.selectById(userId);

        //调用微信支付接口，生成预支付交易单
        //todo 原微信支付代码
        /*
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));
         */
        //todo 微信支付新添加代码跳过微信支付，没有营业执照
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code","ORDERPAID");
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));
        Integer OrderPaidStatus = Orders.PAID;//支付状态，已支付
        Integer OrderStatus = Orders.TO_BE_CONFIRMED;  //订单状态，待接单
        LocalDateTime check_out_time = LocalDateTime.now();//更新支付时间
        orderMapper.updateStatus(OrderStatus, OrderPaidStatus, check_out_time, BaseContext.getCurrentId());
        // 因为没有营业执照，所有直接使用支付成功的代码
        paySuccess(ordersPaymentDTO.getOrderNumber());
        return vo;
    }


    /**
     * 支付成功，修改订单状态
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();

        //根据订单号查询当前用户的订单
        Orders ordersDB = orderMapper.getByNumberAndUserId(outTradeNo, userId);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //通过websocket向客户端推送消息 type、orderId、content
        Map map = new HashMap();
        map.put("type",1); //1表示来单提醒 2表示客户催单
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号："+outTradeNo);
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 用户端订单分页查询
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
        // 设置分页
        Page<Orders> page = new Page<>(pageNum, pageSize);
        LambdaQueryWrapper<Orders> lqw = new LambdaQueryWrapper<>();
        Long userId = BaseContext.getCurrentId();
        lqw.eq(userId!=null,Orders::getUserId,userId);
        lqw.eq(status!=null,Orders::getStatus,status);
        lqw.orderByDesc(Orders::getOrderTime);
        // 分页条件查询
        orderMapper.selectPage(page,lqw);


        List<OrderVO> list = new ArrayList();

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page.getRecords()) {
                Long orderId = orders.getId();// 订单id

                LambdaQueryWrapper<OrderDetail> queryWrapper = new LambdaQueryWrapper<>();
                queryWrapper.eq(!orderId.equals(null),OrderDetail::getOrderId,orderId);
                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.selectList(queryWrapper);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 查询订单详情
     *
     * @param id
     * @return
     */
    public OrderVO details(Long id) {
        // todo 前端传会的id又少两位
        // 根据id查询订单
        Orders orders = orderMapper.getById(id);

        // 查询该订单对应的菜品/套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }


    /**
     * 用户取消订单
     *
     * @param id
     */
    public void userCancelById(Long id) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (ordersDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        // todo 没有微信支付，订单处于待接单状态下取消，需要进行退款
//        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
//            //调用微信支付退款接口
//            weChatPayUtil.refund(
//                    ordersDB.getNumber(), //商户订单号
//                    ordersDB.getNumber(), //商户退款单号
//                    new BigDecimal(0.01),//退款金额，单位 元
//                    new BigDecimal(0.01));//原订单金额
//
//            //支付状态修改为 退款
//            orders.setPayStatus(Orders.REFUND);
//        }

        // 更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     *
     * @param id
     */
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        if (shoppingCartList==null||shoppingCartList.size()==0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    //封装创建order对象
    public Orders CreateOrder(OrdersSubmitDTO ordersSubmitDTO,
                              List<ShoppingCart> shoppingCarts,
                              AddressBook addressBook,
                              Long userId){
        Orders orders = new Orders();
        //校验实收金额
        // 使用 Stream 累加金额
        BigDecimal ordersAmount = shoppingCarts.stream()
                .map(shoppingCart -> shoppingCart.getAmount().multiply(BigDecimal.valueOf(shoppingCart.getNumber()))) // 将每个购物车映射到其销售额（数量*单价）
                .reduce(BigDecimal.ZERO, BigDecimal::add);// 使用 reduce 方法累加所有金额
        //加上打包费和配送费6元
        ordersAmount = ordersAmount.add(BigDecimal.valueOf(ordersSubmitDTO.getPackAmount()))
                .add(BigDecimal.valueOf(6));

        //判断金额是匹配
        if (ordersAmount.equals(ordersSubmitDTO.getAmount())){
            throw new ShoppingCartBusinessException(MessageConstant.Order_Amount_IS_Incorrect);
        }
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setUserId(userId);
        orders.setOrderTime(LocalDateTime.now());
        //详细地址
        orders.setAddress(addressBook.getProvinceName()+addressBook.getDistrictName()+addressBook.getDetail());
        //未进行支付
        orders.setPackAmount(Orders.UN_PAID);
        //待付款
        orders.setStatus(Orders.PENDING_PAYMENT);
        //订单号
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        //获取手机号
        orders.setPhone(addressBook.getPhone());
        //收货人
        orders.setConsignee(addressBook.getConsignee());
        //打包费
        orders.setPackAmount(ordersSubmitDTO.getPackAmount());
        return orders;
    }
}
